Process of making red lakes.



PATENT OFFICE.

CARL IMMERHEISER, or

BADISCHE ANILIN & SODA FABRIK,

MANY, A CORPORATION.

LUDWIGSHAFEN-ON-THE-RHINE, GERMANY, ASSIGNOR TO OFLUDWIGSHAFEN-ON-THE-RHINE, GER- PROCESS OF MAKING- RED LAKES.

Specification of Letters Patent.

Patented Nov. 26, 1907.

Application filed July 10. 1906. Serial No. 325527.

To all whom it may concern:

doctor of philosophy and chemist, subject of 4 the King of Bavaria,residing at Ludwigshafen-on-the-Rhine, in the Kingdom of Bavaria, GermanEmpire, have invented new and useful Improvements in the Production ofRed Color-Lakes, of which the following is a specification.

.In the specifications of Letters Patent Nos. 650,757 and 690,294 isdescribed the production of coloring matter lakes from the azo coloringmatter 1-naphthalene-sulfoacid-2- azo-betanaphthol (known on the marketas litliol red) and from similar coloring inatters, and it is therestated that the metallic lakes can beobtained by partly dissolving andpartly suspending in water a salt of the dyestuii, or the free aciditself, and then treating this solution, or mixture, with a solublemetallic salt, or a metallic hydroxid. I have now discovered that theobjects of the process described in the aforesaid specifications can beadvantageously attained by grinding the coloring matter (either in theorm of the free acid, or of a salt thereof) and the metallic compoundtogether, adding only such a small qu entity of water, or other suit--able liquid (such for instance as alcohol) that the resulting productis, practically dry and the operations of filtering and drying the lakeas required in the former process are ren- A substratum can be, andpreferably is, added to', and ground with, the other materials. Thewater, or other suitable liquid, may bevadded all atonce, or gradually,and, if desired, the metallic salt and the water, or other suitableliquid can be added together in the form of a saturated, or concentratedsolution. The reaction is completed within a short time, usually betweenone (1) and two (2) hours. The exact quantity ries according toconditions observed in grinding. It is preferred under ordinarycircumstances to use about four per cent. of water upon the entirequantity of material ground. More than ten per cent. cannot be used asit results in the formation of a paste dered unnecessary.

of water that can be employed va- I when grinding and yieldsunsatisfactory resu ts.

The following examples will serve to further illustrate how my inventioncan be performed, but it is notlimited to these examples. The parts areby Wei ht.

Example 1. Grind toget er, in an edge runner, one hundred (100) arts ofheavy spar and five (5) parts of powder and, while grinding, spray ontothe mass a solution of two and three-fifths (2.6) parts of bariumchlorid in about seven (7) parts of water and then continue the grindingfor the end of this time the formation of the ba rium lake is com )letedand the lake is ready for use. Instea the e uivalent quantity ofalcohol, or 0t er suitab e liquid, may be employed.

Example 2. Grind together, while dry, five thousan (5,000) parts ofheavy s ar, three hundred (300) parts of l-na htha ene-sulfoacid-2-azobetanaphthol, an eighty-fivc(85) parts of, chalk, then sprayonto the mixture =two hundred (200) parts of water and continue grindinfor a short time. In this ex' ample insteat of chalk, other carbonates,or metallic oxids, or hydroxide, can be employed.

Now what I claim is:

1. -The.process for the production of red color lakes by grindingtogether a hereinbefore defined coloring matter, a metallic compound andless than'ten per cent. (10%) of water, or other suitable li uid, thatthe resulting product is ractical y dry.

2. The process or the production of red. color lakes by grindingtogether a hereinbe- -fore defined coloring matter, a substratum, ametallic com ound and less than ten per cent. (10 o water, or othersuitable liquid, -th at the resulting product is practically dry. Intestimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses. 7

CARE IMMERHEISER. Witnesses: Ennns'r F. EHRHARDT,\

J. Arno. LLOYD.

lithol red? in from one (1), to two (2), hours. At

of water inthis exam 1e,

